FAQ:
Q: The maphack says it couldn’t patch into Warcraft’s memory, what’s wrong? QQ
A: There are several solutions for this.
1 – You are using Windows Vista/7, run it as administrator.
2 – You are using Garena, you have to patch garena before you start the game to make it work.
3 – You are having an ATI video card, update your driver. If it still doesn’t work, your problem, sir.